Add captions for averages from how many items have been counted (#1437)

app/src/main/java/io/github/wulkanowy/ui/modules/grade/summary/GradeSummaryAdapter.kt

@@ -5,6 +5,7 @@ import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
 import androidx.recyclerview.widget.RecyclerView
+import io.github.wulkanowy.R
 import io.github.wulkanowy.data.db.entities.GradeSummary
 import io.github.wulkanowy.data.repositories.PreferencesRepository
 import io.github.wulkanowy.databinding.ItemGradeSummaryBinding
@@ -35,8 +36,12 @@ class GradeSummaryAdapter @Inject constructor(
         val inflater = LayoutInflater.from(parent.context)
 
         return when (viewType) {
-            ViewType.HEADER.id -> HeaderViewHolder(ScrollableHeaderGradeSummaryBinding.inflate(inflater, parent, false))
-            ViewType.ITEM.id -> ItemViewHolder(ItemGradeSummaryBinding.inflate(inflater, parent, false))
+            ViewType.HEADER.id -> HeaderViewHolder(
+                ScrollableHeaderGradeSummaryBinding.inflate(inflater, parent, false)
+            )
+            ViewType.ITEM.id -> ItemViewHolder(
+                ItemGradeSummaryBinding.inflate(inflater, parent, false)
+            )
             else -> throw IllegalStateException()
         }
     }
@@ -51,13 +56,27 @@ class GradeSummaryAdapter @Inject constructor(
     private fun bindHeaderViewHolder(binding: ScrollableHeaderGradeSummaryBinding) {
         if (items.isEmpty()) return
 
+        val context = binding.root.context
+        val finalItemsCount = items.count { it.finalGrade.matches("[0-6][+-]?".toRegex()) }
+        val calculatedItemsCount = items.count { value -> value.average != 0.0 }
+        val finalAverage = items.calcAverage(
+            preferencesRepository.gradePlusModifier,
+            preferencesRepository.gradeMinusModifier
+        )
+        val calculatedAverage = items.filter { value -> value.average != 0.0 }
+            .map { values -> values.average }
+            .reversed() // fix average precision
+            .average()
+
         with(binding) {
-            gradeSummaryScrollableHeaderFinal.text = formatAverage(items.calcAverage(preferencesRepository.gradePlusModifier, preferencesRepository.gradeMinusModifier))
-            gradeSummaryScrollableHeaderCalculated.text = formatAverage(items
-                .filter { value -> value.average != 0.0 }
-                .map { values -> values.average }
-                .reversed() // fix average precision
-                .average()
+            gradeSummaryScrollableHeaderFinal.text = formatAverage(finalAverage)
+            gradeSummaryScrollableHeaderCalculated.text = formatAverage(calculatedAverage)
+            gradeSummaryScrollableHeaderFinalSubjectCount.text =
+                context.getString(R.string.grade_summary_from_subjects, finalItemsCount, items.size)
+            gradeSummaryScrollableHeaderCalculatedSubjectCount.text = context.getString(
+                R.string.grade_summary_from_subjects,
+                calculatedItemsCount,
+                items.size
             )
         }
     }
@@ -71,7 +90,8 @@ class GradeSummaryAdapter @Inject constructor(
             gradeSummaryItemPredicted.text = "${item.predictedGrade} ${item.proposedPoints}".trim()
             gradeSummaryItemFinal.text = "${item.finalGrade} ${item.finalPoints}".trim()
 
-            gradeSummaryItemPointsContainer.visibility = if (item.pointsSum.isBlank()) View.GONE else View.VISIBLE
+            gradeSummaryItemPointsContainer.visibility =
+                if (item.pointsSum.isBlank()) View.GONE else View.VISIBLE
         }
     }
 

app/src/main/res/layout/scrollable_header_grade_summary.xml

@@ -20,6 +20,7 @@
             android:layout_height="wrap_content"
             android:gravity="center"
             android:minLines="2"
+            android:textStyle="bold"
             android:text="@string/grade_summary_calculated_average"
             android:textSize="16sp" />
 
@@ -30,6 +31,15 @@
             android:gravity="center_horizontal"
             android:textSize="21sp"
             tools:text="6,00" />
+
+        <TextView
+            android:id="@+id/gradeSummaryScrollableHeaderCalculatedSubjectCount"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="5dp"
+            android:gravity="center_horizontal"
+            android:textSize="13sp"
+            tools:text="from 8 subjects" />
     </LinearLayout>
 
     <LinearLayout
@@ -43,6 +53,7 @@
             android:layout_height="wrap_content"
             android:gravity="center"
             android:minLines="2"
+            android:textStyle="bold"
             android:text="@string/grade_summary_final_average"
             android:textSize="16sp" />
 
@@ -53,5 +64,14 @@
             android:gravity="center_horizontal"
             android:textSize="21sp"
             tools:text="6,00" />
+
+        <TextView
+            android:id="@+id/gradeSummaryScrollableHeaderFinalSubjectCount"
+            android:layout_width="match_parent"
+            android:layout_marginTop="5dp"
+            android:layout_height="wrap_content"
+            android:gravity="center_horizontal"
+            android:textSize="13sp"
+            tools:text="from 5 subjects" />
     </LinearLayout>
 </LinearLayout>

app/src/main/res/values/strings.xml

@@ -101,6 +101,7 @@
     <string name="grade_summary_predicted_grade">Predicted grade</string>
     <string name="grade_summary_calculated_average">Calculated average</string>
     <string name="grade_summary_final_average">Final average</string>
+    <string name="grade_summary_from_subjects">From %d of %d subjects</string>
     <string name="grade_menu_summary">Summary</string>
     <string name="grade_menu_statistics">Class</string>
     <string name="grade_menu_read">Mark as read</string>